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I have been tracking down the history of my Borden Mite which was originally owned by S/Sgt Joe Shelton. Interestingly, Joe was in the Air Force and was stationed in England for part of the time when he raced the Borden Mite and I have found a fair amount of information about him and the car from several issues of an old English hobby magazine.

In tracking down the history of my car, I found that there were several other Dooling .29 powered Borden Mites in Italy and possibly one other in England.

This surprised me since I just never gave much thought to the possibility that these cars might have been raced outside the United States. But, the .29-class (i.e. 5 cc class in Europe) was more popular in Europe at that point in time than it was in the US, so I probably should not have been too surprised to find that the cars raced (and dominated the 5cc class for a time) on British and European tracks.
Nonetheless, these cars are rare...or, at least, original examples are quite rare. I know of only two cars (yours and mine) that I would swear are original cars, but there may be one or two others that I don't know about.
Take care.
John